JP6327093B2 - Dehumidifier - Google Patents

Description

  The present invention relates to a dehumidifier capable of performing efficient operation.

  In a conventional air conditioner, the compressor is driven by a d-axis current calculated from torque or the like for rotating the compressor (see, for example, Patent Document 1).

Japanese Patent No. 4053968

  However, since torque-priority driving was performed, there was a problem that power consumption was high and driving efficiency was poor.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a dehumidifier capable of performing an efficient operation.

  A dehumidifier according to the present invention includes a dehumidifier housing, a blower that generates an air flow that sucks indoor air into the dehumidifier housing and discharges dry air, and a compressor that compresses the refrigerant. A dehumidifying unit that removes moisture contained in the room air and generates the dry air, a humidity sensor that detects the humidity of the room air, a temperature sensor that detects the temperature of the room air, and the blower. A control unit that controls the dehumidifying unit, the excitation current component of the magnetic flux direction component of the rotor of the compressor is a d-axis current, and the control unit determines an operation rank based on a set condition, and determines An operation rank determination unit that outputs a compressor frequency command value and a blower rotation speed command value corresponding to the operation rank, and a blower drive that drives the blower so that the rotation speed of the blower satisfies the blower rotation speed command value Part , The humidity of the indoor air, the temperature of the indoor air, the operating frequency of the compressor, and the numerical range of the rotational speed of the blower and the value of the d-axis current that maximizes the operating efficiency of the compressor in those numerical ranges And a d-axis current value corresponding to the detected humidity by the humidity sensor, the detected temperature by the temperature sensor, the compressor frequency command value, and the blower rotation speed command value from the table. A d-axis current determining unit that outputs the shaft current command value, and a three-phase current that satisfies the d-axis current command value and the compressor operating frequency satisfies the compressor frequency command value. And a compressor driving unit that supplies the compressor.

  In the present invention, the numerical value ranges of the humidity of the indoor air, the temperature of the indoor air, the operating frequency of the compressor, and the rotational speed of the blower, and the d-axis current value at which the operating efficiency of the compressor is highest in those numerical ranges. A described table is provided. Then, the value of the d-axis current corresponding to the condition at that time is read from the table, and a three-phase current that satisfies the compressor frequency command value while the d-axis current satisfies this value is obtained. Supply to the compressor. Thereby, an efficient driving | operation can be performed.

It is sectional drawing which shows the dehumidifier which concerns on Embodiment 1 of this invention. It is a block diagram which shows the dehumidifier which concerns on embodiment of this invention. It is a perspective view which shows the dehumidification part which concerns on Embodiment 1 of this invention. It is a block diagram which shows the dehumidification part which concerns on Embodiment 1 of this invention. It is a block diagram which shows the control part which concerns on Embodiment 1 of this invention. It is a block diagram which shows the compressor drive part which concerns on Embodiment 1 of this invention. It is a block diagram which shows the control part which concerns on Embodiment 2 of this invention.

  A dehumidifier according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a dehumidifier according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing the dehumidifier according to the embodiment of the present invention. The dehumidifier housing 1 is configured to be independent. The blower 2 sucks the indoor air A into the dehumidifier housing 1 from the suction port 3 and generates an air flow that discharges the dry air B from the exhaust port 4 into the room. The blower 2 has a blower fan and a fan motor that rotates the blower fan.

  The dehumidifying unit 5 generates dry air B by removing moisture contained in the room air A using a refrigerant. The water storage tank 6 is detachably attached to the dehumidifier housing 1 and accumulates moisture removed from the room air A.

  An operation unit 7 is provided on the upper surface of the dehumidifier housing 1. The operation unit 7 includes a power switch of the dehumidifier, a selection unit that selects an operation mode, and an input unit through which a user inputs a desired set humidity. A humidity sensor 8, a temperature sensor 9, and a control unit 10 are provided in the dehumidifier housing 1. The humidity sensor 8 detects the humidity of the room air A, and the temperature sensor 9 detects the temperature of the room air A. When the control unit 10 detects that the power switch of the operation unit 7 is turned on and the dehumidifying mode is selected as the operation mode, the control unit 10 controls the blower 2 and the dehumidifying unit 5 so that the humidity of the room air becomes the set humidity. .

  FIG. 3 is a perspective view showing the dehumidifying unit according to Embodiment 1 of the present invention. FIG. 4 is a block diagram showing the dehumidifying unit according to Embodiment 1 of the present invention. The compressor 11, the condenser 12, the decompression device 13, and the evaporator 14 are connected in order by piping, and the refrigerant circuit is comprised. When the compressor 11 is driven, the refrigerant circulates in the refrigerant circuit. Specifically, the compressor 11 first compresses the refrigerant. Next, the condenser 12 cools the refrigerant compressed by the compressor 11. Next, the decompression device 13 decompresses and expands the refrigerant cooled by the condenser 12. Next, the evaporator 14 absorbs heat from the refrigerant decompressed and expanded by the decompression device 13 to condense and remove moisture contained in the indoor air A. The decompression device 13 is a capillary tube here, but is not limited to this and may be another decompression device.

  FIG. 5 is a block diagram showing the control unit according to Embodiment 1 of the present invention. When the operation rank determination unit 15 detects that the dehumidification mode is selected as the operation mode, the operation rank determination unit 15 determines the operation rank based on the set conditions such as the set humidity, the detected humidity by the humidity sensor 8, and the detected temperature by the temperature sensor 9. . And the operation rank determination part 15 outputs the compressor frequency command value and fan rotation speed command value corresponding to the determined operation rank. The blower drive unit 16 drives the blower 2 so that the rotational speed of the blower 2 satisfies the blower rotational speed command value.

  Here, the compressor frequency command value is the target operating frequency (Hz) of the compressor 11, and the blower rotational speed command value is the target rotational speed (rpm) of the blower 2. The compressor frequency command value and the blower rotation speed command value are determined for each operation rank, and the higher the operation rank, the greater the corresponding compressor frequency command value and blower rotation speed command value. And the dehumidification capability of a dehumidifier becomes high, so that the operating frequency of the compressor 11 is large and the rotation speed of the air blower 2 is large. Table 1 below shows an example of the operation rank, the compressor frequency command value and the blower rotation speed command value corresponding to the operation rank.

  In the table 17, the humidity of the room air, the temperature of the room air, the operating frequency of the compressor 11, and the numerical range of the rotational speed of the blower 2 and the d-axis current that maximizes the operating efficiency of the compressor in those numerical ranges. The value of is described. Here, the excitation current component of the magnetic flux direction component of the rotor of the compressor 11 is the d-axis current, and the torque current component whose phase is advanced by 90 degrees from the excitation current component is the q-axis current.

  Since the refrigerant pressure in the refrigerant circuit of the dehumidifying section, that is, the operating load of the compressor, varies depending on the humidity of the indoor air, the temperature of the indoor air, and the amount of air blown by the blower, Predicted and appropriate d-axis current values are described in Table 17. If the d-axis current is small, the power consumption of the compressor 11 is reduced. However, if the d-axis current is insufficient with respect to the pressure of the refrigerant in the refrigerant circuit, the d-axis voltage is insufficient and the phase current of the motor of the compressor 11 increases. Overcurrent. As a result, the safety device is activated and the operation of the dehumidifier is stopped. Therefore, the value of the d-axis current set in the table 17 is a value such that the d-axis current is not insufficient under each condition and the power consumption of the compressor 11 is minimized.

  Table 2 below is an example of the table 17. However, since the operation frequency of the compressor 11 and the rotation speed of the blower 2 are determined as a set for each operation rank, the rotation speed of the blower 2 is omitted in the following table.

  The d-axis current determination unit 18 reads the d-axis current value corresponding to the detected humidity by the humidity sensor 8, the detected temperature by the temperature sensor 9, the compressor frequency command value, and the blower rotation speed command value from the table 17, and d-axis Output as current command value. The compressor drive unit 19 supplies the compressor 11 with a three-phase current such that the operating frequency of the compressor 11 satisfies the compressor frequency command value while the d-axis current satisfies the d-axis current command value.

  The d-axis current update interval is, for example, every second. However, since it takes time to change the refrigerant pressure by the compressor 11, it is necessary to change the d-axis current in consideration of the change time. Therefore, the d-axis current determination unit 18 immediately increases the d-axis current command value when the compressor frequency command value increases, but only when the compressor frequency command value decreases for a certain time (for example, 3 minutes). After delaying, the d-axis current command value is lowered. In addition, the d-axis current determining unit 18 outputs a d-axis current command value having a predetermined value regardless of the detected humidity, the detected temperature, the compressor frequency command value, and the blower rotation speed command value at the time of startup. These delay times and operation times at the time of start-up are measured by the time measuring unit 20.

  FIG. 6 is a block diagram showing the compressor drive unit according to Embodiment 1 of the present invention. The configuration of the compressor drive unit 19 is used as a general-purpose inverter device control method, and shows an example of primary magnetic flux control for controlling the magnetic flux on the control axis (γ-δ axis) to be constant. It is a thing. In general vector control, a three-phase current is converted into d-q coordinates of a d-axis current and a q-axis current. However, in the primary magnetic flux control shown here, since the exact rotor position is not detected, the dq coordinates cannot be obtained accurately. For this reason, γ-δ coordinates are used as the coordinate system for control as the estimated dq coordinates.

The integrator 21 integrates the primary angular frequency ω ₁ to obtain the electrical angle phase θ _m . The first coordinate conversion unit 22 converts the two phases I _u and I _v out of the three-phase current into the γ-axis current I _γ and the δ-axis current I _δ using the electrical angle phase θ _m . The frequency compensator 23 obtains a frequency compensation amount Δω for compensating the compressor frequency command value ω ^* according to the fluctuation of the δ-axis current I _δ . The frequency error calculation unit 24 subtracts the frequency compensation amount Δω from the compressor frequency command value ω ^* to obtain the primary angular frequency ω ₁ of the voltage vector. The voltage command calculation unit 25 uses the primary angular frequency ω ₁ , the γ-axis current command value I _γ ^* , the γ-axis current I _γ , and the δ-axis current I _δ to change the operating frequency of the compressor 11 to the compressor frequency command value ω. ^* the voltage command value for driving the compressor 11 so as to satisfy V _gamma ^*, determined by the V _[delta] ^* control arithmetic expression. The second coordinate conversion unit 26 converts the voltage command values V _γ ^* and V _δ ^* into a control voltage V _uvw using the electrical angle phase θ _m . The inverter 27 outputs three-phase currents I _u , I _v , I _w to the compressor 11 based on the control voltage V _uvw .

  As described above, in this embodiment, the humidity of the room air, the temperature of the room air, the operating frequency of the compressor 11, and the numerical ranges of the rotational speed of the blower 2 and the operating efficiency of the compressor in those numerical ranges. A table 17 in which the value of the d-axis current that gives the highest value is described is provided. Then, the value of the d-axis current corresponding to the condition at that time is read from the table 17, and the three-phase current is such that the operating frequency of the compressor 11 satisfies the compressor frequency command value while the d-axis current satisfies this value. Is supplied to the compressor 11. Thereby, efficient operation with low power consumption can be performed.

Embodiment 2. FIG.
FIG. 7 is a block diagram showing a control unit according to Embodiment 2 of the present invention. Instead of the d-axis current determining unit 18 and the time measuring unit 20 of the first embodiment, the first d-axis current determining unit 28, the second d-axis current determining unit 29, the d-axis current selecting unit 30, and the time measuring unit 31 are used. Is provided. Other configurations are the same as those of the first embodiment.

  The first d-axis current determination unit 28 reads from the table 17 the d-axis current value corresponding to the humidity detected by the humidity sensor 8, the temperature detected by the temperature sensor 9, the compressor frequency command value, and the blower rotation speed command value. And output as a first d-axis current command value.

  The second d-axis current determination unit 29 calculates a d-axis current corresponding to the q-axis current and outputs it as a second d-axis current command value. The d-axis current selection unit 30 selects one of the first d-axis current command value and the second d-axis current command value and outputs it as the third d-axis current command value. Then, as in the first embodiment, the compressor drive unit 19 is configured so that the d-axis current satisfies the third d-axis current command value and the operating frequency of the compressor 11 satisfies the compressor frequency command value. The phase current is supplied to the compressor 11.

  Here, when the d-axis current selection unit 30 selects the second d-axis current command value, the operation efficiency of the compressor 11 becomes lower than when the first d-axis current command value is selected, and the compression is performed. The torque of the machine 11 becomes high. Therefore, when the first d-axis current command value changes, the d-axis current selection unit 30 first selects the second d-axis current command value at which the torque becomes high, and the operation efficiency is reduced after a certain time has elapsed. A first d-axis current command value to be increased is selected. The delay time is measured by the timer 31. Thereby, it is possible to perform an efficient operation with less power consumption while improving the change speed of the refrigerant pressure by the compressor 11.

DESCRIPTION OF SYMBOLS 1 Dehumidifier housing | casing, 2 air blower, 5 dehumidification part, 8 humidity sensor, 9 temperature sensor, 10 control part, 11 compressor, 12 condenser, 13 decompression device, 14 evaporator, 15 operation rank determination part, 16 fan drive Unit, 17 table, 18 d-axis current determining unit, 19 compressor driving unit, 28 first d-axis current determining unit, 29 second d-axis current determining unit, 30 d-axis current selecting unit

Claims (5)

A dehumidifier housing;
A blower for generating an air current that sucks indoor air into the dehumidifier housing and discharges dry air;
A dehumidifying unit that includes a compressor that compresses a refrigerant, and generates the dry air by removing moisture contained in the room air using the refrigerant;
A humidity sensor for detecting the humidity of the indoor air;
A temperature sensor for detecting the temperature of the indoor air;
A control unit for controlling the blower and the dehumidifying unit;
The exciting current component of the magnetic flux direction component of the rotor of the compressor is a d-axis current,
The controller is
An operation rank determining unit that determines an operation rank based on setting conditions and outputs a compressor frequency command value and a blower rotation speed command value corresponding to the determined operation rank;
A blower drive unit that drives the blower so that the rotational speed of the blower satisfies the blower rotational speed command value;
The numerical value ranges of the humidity of the indoor air, the temperature of the indoor air, the operating frequency of the compressor, and the rotational speed of the blower, and the d-axis current value at which the operating efficiency of the compressor is highest in those numerical ranges. The described table,
The humidity detected by the humidity sensor, the temperature detected by the temperature sensor, the compressor frequency command value, and the d-axis current value corresponding to the blower rotation speed command value are read from the table and output as a d-axis current command value. a d-axis current determining unit;
A compressor driving unit that supplies a three-phase current to the compressor such that an operating frequency of the compressor satisfies the compressor frequency command value while the d-axis current satisfies the d-axis current command value. Dehumidifier characterized by.   2. The dehumidifier according to claim 1, wherein the d-axis current determination unit decreases the d-axis current command value after delaying by a certain time when the compressor frequency command value decreases.   The d-axis current determining unit sets the d-axis current command value of a predetermined value at the time of start-up regardless of the detected humidity, the detected temperature, the compressor frequency command value, and the blower rotation speed command value. The dehumidifier according to claim 1 or 2, wherein the dehumidifier outputs. A dehumidifier housing;
A blower for generating an air current that sucks indoor air into the dehumidifier housing and discharges dry air;
A dehumidifying unit that includes a compressor that compresses a refrigerant, and generates the dry air by removing moisture contained in the room air using the refrigerant;
A humidity sensor for detecting the humidity of the indoor air;
A temperature sensor for detecting the temperature of the indoor air;
A control unit for controlling the blower and the dehumidifying unit;
The exciting current component of the magnetic flux direction component of the rotor of the compressor is a d-axis current,
A torque current component whose phase is advanced by 90 degrees from the excitation current component is a q-axis current,
The controller is
An operation rank determining unit that determines an operation rank based on setting conditions and outputs a compressor frequency command value and a blower rotation speed command value corresponding to the determined operation rank;
A blower drive unit that drives the blower so that the rotational speed of the blower satisfies the blower rotational speed command value;
The numerical value ranges of the humidity of the indoor air, the temperature of the indoor air, the operating frequency of the compressor, and the rotational speed of the blower, and the d-axis current value at which the operating efficiency of the compressor is highest in those numerical ranges. The described table,
A d-axis current value corresponding to the humidity detected by the humidity sensor, the temperature detected by the temperature sensor, the compressor frequency command value, and the blower rotation speed command value is read from the table, and the first d-axis current command value is read. A first d-axis current determining unit that outputs as:
A second d-axis current determining unit that calculates a d-axis current corresponding to the q-axis current and outputs the calculated d-axis current as a second d-axis current command value;
A d-axis current selector that selects one of the first d-axis current command value and the second d-axis current command value and outputs it as a third d-axis current command value;
A compressor driving unit that supplies a three-phase current to the compressor such that an operating frequency of the compressor satisfies the compressor frequency command value while the d-axis current satisfies the third d-axis current command value; A dehumidifier.   When the first d-axis current command value changes, the d-axis current selection unit first selects the second d-axis current command value, and after a predetermined time has elapsed, the first d-axis current command value is selected. The dehumidifier according to claim 4, wherein a command value is selected.

Images